With this essay I identify the challenges that a film music composer may face in his career in the film music industry. I present and discuss this subject in three parts: budget, time and communication, and suggest how to deal with these. The methods I will use are based on theory, interviews with three Swedish active film music composers and analyzes of previous film projects during my education at Royal College of Music in Stockholm (KMH) and Stockholm University of the Arts (SKH). The purpose of the thesis is to understand how to work successful and sustainably with film music composition in today's film industry. The thesis has been written during the spring term of 2021 at KMH/SKH. The movies from the analysed film projects can be found at the end of the text.